The answer to 'best boiler' is that the best boiler for your home depends on several factors, including the size of your home, your heating needs, and your budget. Generally, high-efficiency condensing boilers are considered among the best options for most homeowners. These boilers are designed to be highly energy-efficient, which can save you money on your energy bills in the long run.
Condensing boilers work by capturing the heat that would otherwise be lost through the exhaust, and using it to heat your home. This makes them much more efficient than traditional boilers, with efficiency ratings often exceeding 90%. They also tend to be more compact and easier to install than older boiler models.